<html>
<body>
 
<select aria-label="selection_list" size="10" id="listbox">
<optgroup label="Enabled" id="listbox_optgroup_enabled">
    <option value="listbox_e1" id="listbox_option_enabled_one">One</option>
    <option value="listbox_e2">Two</option>
    <option value="listbox_e3">Three</option>
    <option value="listbox_e4">Four</option>
</optgroup>
</select>
</body>
</html>
